There's a revival happening in the health world, not just of kettlebells and keto but of something far more ancient: fasting. More and more people are discovering the benefits of intermittent fasting—timed eating windows, periods of food abstinence, and cellular restoration.
Although trends are the rage and leggings are seen everywhere, fasting was not an original idea. It was a Biblical one. Physical wellness is often connected to spiritual obedience. When it pertains to fastings, there are models in the Bible and stories that show how God's people are rewarded for their sacrifice and enjoy a stronger foundation with Christ.
Intermittent fasting gained popularity among health influencers, but first, God's children would fast from things (not always food) to focus on rejuvenation and redemption.
Fasting was not taught to deny food. The act was about denying self to focus on God. When we view intermittent fasting through biblical eyes, we reclaim it as more than a fitness trend. The divine invitation to walk in ancient wisdom fueled both body and soul.
Biblical History of Fasting
Fasting is one of the oldest spiritual practices in the Bible. It shows up early and often, not as a health regimen but as a divine response. When Moses stood in God's presence on Mount Sinai, he fasted without food and water for forty days (Exodus 34:28). This fast is considered one of the most rigorous in terms of sacrifice, as it entailed a complete surrender of physical needs to focus on spiritual ones.
In 1 Kings 19:8, Elijah also fasted for food and water for forty days as he journeyed to the mountain of God. Perhaps most strikingly, Jesus fasted forty days in the wilderness before beginning His public ministry (Matthew 4:2). In all three instances, these men of God chose to put their bodies through considerable inconvenience to show themselves–and God–their full dependence and allegiance to the Lord.
However, those weren't the only models of fasting in the Old Testament.
Israel fasted during moments of national crisis as a form of repentance. In Judges 20:26, there is a record of only a day of fasting and prayer as Israel's people sought guidance in battle. In Jonah 3, when the Ninevites heard God's warning, the entire city fasted, from king to livestock, as an act of urgent repentance. Fasting was Israel's way of saying, "We need You more than we need anything else."
The early church inherited this legacy. Acts 13:2-3 shows church leaders fasting before sending out missionaries. Paul and Barnabas fasted and prayed before appointing elders (Acts 14:23). In other words, fasting wasn't a fringe practice—it was central to the life of God's people. In each case, it wasn't driven by weight loss or longevity but by love, surrender and mission.
The Evolution of Intermittent Fasting
Biblical fasting has been practiced in various forms, all centered on a heart devoted to God. It's essential to recognize that not all fasts in Scripture were complete food abstentions, nor were some about food at all.
The body can only survive for a few days without hydration, but there are biblical records of people surviving for 40 days without food or water. The Holy Spirit has shown His people through other biblical accounts that drastic measures aren't always necessary.
Esther called for such a fast of a few days in Esther 4:16 when the Jewish people faced extermination. Paul also fasted for three days absolutely after his conversion experience (Acts 9:9). These fasts were tied to a sense of urgency and deep spiritual distress.
More commonly, Scripture records partial fasts, where only certain foods were avoided. Daniel, for example, refused the king's rich food and wine in Daniel 1:12, then later abstained from meat, wine, and rich delicacies for three weeks in Daniel 10:3. His fast was an act of consecration and seeking understanding from God. Today, many adopt similar practices, modeling modern "Daniel fasts" on these examples.
There is also a non-food fast, also known as a soul fast. Isaiah 58 strongly rebukes those who fast from food while continuing injustice, pride, and selfishness. God makes it clear that true fasting is more than dietary denial; it's about breaking chains of oppression, feeding the hungry, and clothing the naked. Jesus also hinted at this in Matthew 6 when He instructed His disciples to fast without looking gloomy or showy, signaling that fasting is a personal offering, not a public performance.
Sacred Practice to Intermittent Trend
So how did we go from Moses fasting on Sinai to gym-goers timing their meals with apps? The modern trend of intermittent fasting gained momentum through research into metabolic health, hormone balance, and longevity. Studies now show that restricted eating windows can aid fat loss, improve insulin sensitivity, support brain health, and even extend lifespan. But these discoveries echo what Scripture already taught: denying the body temporarily can awaken something greater.
In the early church, regular fasting wasn't optional. Early Christian documents, such as the Didache, recommended fasting on Wednesdays and Fridays as a form of spiritual rhythm and remembrance. These were not legalistic demands but life-giving disciplines. Christians fasted to remember Christ's suffering, to humble themselves before God, and to live with open hands.
In many ways, modern intermittent fasting is a reclaimed shadow of those ancient practices. While the motivations may differ—weight loss, productivity, digestive health—the mechanics are surprisingly similar. Skipping meals for a purpose, entering cycles of eating and rest, and learning to live with intention are not new ideas.
The difference lies in the why. For the believer, intermittent fasting can be more than a wellness strategy. It can become a holy space. Every hunger pang can prompt prayer. Every delay in eating can become a moment to reflect on the Bread of Life. Fasting reminds us that our bodies are not our own; they are temples of the Holy Spirit (1 Corinthians 6:19-20). And as such, they deserve stewardship—not just in training, but in worship.
Even today's secular fasting schedules—like 16:8 (fast for 16 hours, eat during 8)—mirror some of the early Christian rhythms of sunrise-to-sunset fasts or weekly days of abstinence. When practiced with a spiritual purpose, these windows become more than eating plans. They become offerings.
The Heart of Fasting
Christians are individuals who prioritize both health and holiness. We are known as the temple of the Holy Spirit (1 Corinthians 6:19-20), so physical fitness also includes caring for a special guest.
We don't need to choose between physical and spiritual goals. The physical can serve the spiritual. Intermittent fasting, viewed through a biblical lens, offers us a chance to reclaim a practice that has always been about hunger for God, not just food.
When considering fasting, ask yourself more than how long you should go without food. Ask why. Let your next fast be an act of worship, not just willpower. Take time to pray, to read Scripture, and to examine your heart. Let your body remind you that you don't live by bread alone but by every word from the mouth of God (Matthew 4:4).
Intermittent fasting may trend in this culture, but its origin lies at the feet of the Lord. Use it not only to strengthen your discipline but to deepen your devotion. Your body might change. But your spirit will never be the same.
